Shell for water-heating coils



Feb. 4, 1930. A. L. LEITCH 1,746,085

\ SHELL FOR WATER HEATING cons Filed Dec. 14, 1927 In wen for flL Ila/72% Otherobjects and advantages residein the special construction and combination of the UNIT D STATES P t ntedfeb. 4', 1 930 'AIILGIHII'BALID L. LEITCH, or MARINECiIY, MIoHioAN SHELL FOR; WATER-HEATIPTG ooILs Application filed December 14, 1927f"eria11No. 240,003.

The present invention relates to a shell for v the coil of water'heaters and has, for its principal object to arrange an inner shell within 'the coil housing adapted to form atrap' for I 5 the heat in order to retain the same inco'ntact with the coil so as to obtain the greatest possible result from the heat provided for heating the coil whereby to improve the efiiciency and construction or operation thereof, and which at the same time is of a simple and practical construction,-inexpensivetomanufactureand otherwise welladapted for the purposes for which the same is intended.

various elements comprising the invention,

' reference being had to the accompanying 7 Cape through the openings 18 and pass down- I wardly between the walls 15 and 16 and out drawings forming a part hereof, wherein:

Figure 1 1s a vertical sectlonal view through the heater illustrating'the construction of the inner-shell therefor, and r o Figure 2 isa transverse sectional view therethrough.

Referring now to the drawin in detail,

I; have shown my invention adapted foruse particularly with respect to water heaters wherein a spirally arranged water coil pipe 5 is disposed vertically-within a housing 6, with its feed and discharge pipes? and 8 respec I tively extending laterally therefrom and be neath which may be arranged the heating ele-'v ment 9, which is in the form of a gas burner. At the upper end'of thehousing '6 is arranged a stack 10, providing for the escape ofthe gasandheat generated in the housing through the use of the burner. o

It is-the usual practicein devices of this character to permit the'heat generated by the burner to pass directly upwardly through the ,coil '5 and allow the same to escape through the stack 10 and it is found that very little of th e heat is retainedwithin the housing for circulation about the coil.

"Inorder to retainthe heat about the coil so asto'ut lize a greater "portion thereof in pore 1 forming, the heating function; I provide a shell ll arranged within the housing having its wall disposed in spaced relation therefrom "andforming a substantial closurefor the coil;

Thelower end of the shell isopen providing; for the free admission of the heat from the burner 9 and at spaced intervals about the lower edgeof the shell I' arrange brackets "12 by means'of which the shell is'secured' tothe wall of the housing. (I

The shell is formed of double walls arranged in'spacecl relation and comprising an inner wall 15 andouter wall 16 closed at their upper and lower ends whereby to forman airspace between the walls of the shell as indicated at 17 A plurality of openings 18 are formed adjacent the upper portion of the through the opening 19 of the lower portion thereof, as indicated by the arrows, into the housing so that the same will be permittedv to escape through the stack.

One side of the housing 6 may be provided with a'door 20 affording access for lighting and controlling the burner 9.

It will be apparent that by providing a i shell of this character about the coil that a substantial portionof the heat willbe retained therein and to which the coil is subjected. By preventing the immediate escape of the heat from the housing the heating of enable a reduction in the amount of fuel consumed in orderto supply the necessary heat to the coil.

It is obvious that the invention is susceptible of various changes and modificatons,

the coil will progress more rapidly and also I of Having thus described my invention what I claim as new is: V

In a heater of the class described comprising a housing having a heating element and a coil arranged therein in heating relation with respect to each other, said coil having its convolutions disposed in spaced relation and a shell arranged within the housing with their respective walls in spaced relation and with the walls of the shell spaced outwardly from the coil, said shell having its lower endopen for receiving the hot gases from the'heating element and closed at its upper end'for pre venting the escape of the said gases atthe top thereof said shell being formed with inner and outer spaced walls closed at their upper and lower ends and provided with openings communicating with the space therebetween,

said openings in the inner walls of the shell being disposed at the upper portion thereof with the openings in the outer walls of the shell disposed at the lower portion thereof and communicating with the housing, whereby to provide aflue within the housing for i directing the gases downwardly between the V walls of the shell after passing from the coil into the housing. v

In testimony whereof I affix my signature.

ARCHIBALD L. 'LEITCH. 

